There are many kinds of corundum refractories, such as: sintered corundum bricks, corundum castables, chrome steel jade castables, zirconium corundum bricks, electrofused corundum bricks, corundum mullite bricks, corundum mullite castables and so on.
Sintered corundum brick: sintered corundum refers to calcined alumina as raw material, made of finely ground ball or embryo, sintered at a high temperature of 1750 ° C - 1900 ° C from the refractory clinker, its purity is slightly lower than the plate corundum, with bulk density, low porosity, high temperature has a few good resistance to thermal shock and resistance to slag erosion, grain strength is high, the strength of the sintered corundum varies depending on the AI2O3 content, the sintering temperature and microstructure, and the sintering temperature and microstructure. temperature and microstructure.
Sintered corundum bricks are refractory products with alumina content greater than 90% and corundum as the main crystalline phase. Sintered corundum brick has the following characteristics:
1, high refractoriness, refractoriness ≥ 1800 ℃, melting point up to 2050 ℃;
2, with coarse crystallization, the development of a good α-AI2O3 crystal structure, greatly improving the creep resistance of the product;
3, plate sheet crystal structure, small open pores, showing low porosity, low water absorption, more internal closed pores, good resistance to peeling performance;
4, the production process does not add any additives, high purity, good volume stability, re-fired shrinkage is very small;
5, good chemical stability, acidic or alkaline slag, metal and glass liquids have strong resistance, good corrosion resistance.
Corundum castable: corundum castable is a kind of unshaped refractory material made of corundum as aggregate and powder, meanwhile adding α-AL2O3 super fine powder, cement, aluminate and some chemical reagents dispersant, after high temperature firing. General corundum castables include: chrome steel jade castables, zirconium corundum castables, brown corundum castables, composite corundum castables and so on.
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